Marrakech tours ,4 days sahara desert tour in Morocco

We are traveling to Marrakech next few weeks , and we are interested in a 3 or 4 days desert trip departue from Marrakech to merzouga desert.
we seached on google and we get this itinerary with
Morocco-Excursion.com :

Day 1: Marrakech - dades valley

Day 2: Dades valley - Merzouga desert

Day 3: Merzouga - Marrakech

My quiestions are :

How cold is the atlas mountains in February ?

3 days is enough to descouver the sahara desert and the berber villages ?

The last day (Marrakech - Merzouga) for how many kms we have to drive ??

Hello !You have to know that the track over the mountain pass was not driven by anybody, and not passable at all. We had to return. This was in 30 December. Then, we tried going from Dades uphill - the road was swallowed by flood, but possible